Chinese Leap Lunar Months

First, we need to know the difference between the Chinese Astronomical Calendar and
the Civil Calendar. The Chinese Civil Calendar is posted by the Chinese government. The
Chinese Astronomical Calendar is used by astronomers who work for government. The Astronomical
Calendar is much more accurate than the Civil Calendar. The major difference is the
assignment of leap months. We know a leap month is assigned if a lunar month (new moon to
new moon) has no Solar Center Point. But, what do we do when
the new moon day and the Solar Center Point fall on the same day?

If the new moon day and the Solar Center Point are on the same day,
the lunar month contains that Solar Center Point in the Civil Calendar system. In
the Astronomical Calendar, we have to compare the new moon time and the Solar Center Point time
(hour, minute and second). The lunar month contains that Solar Center Point only if the
Solar Center Point time comes after new moon time.

Because they are different, the listing of leap month assignments
is different. From the following comparison charts of Beijing Time, PST and EST from
1979-2001. We find

Leap month assignment is different between the Astronomical and the Civil Calendar

Extra 1985 leap month was removed in China time zone

Leap month assignments are different from different time zones in the Civil Calendar

Leap month assignments are the same from different time zones
in the Astronomical Calendar

China Beijing Time or Taiwan Standard
Time - Longitude East 120th degree